Cummins 4B 3.9L, 6B 5.9L, 4B 4.5L Inframe Engine Rebuild Kit, New (IF4089185)

Think you know the truth about Aftermarket Rebuild Kits? We’d bet you’d be surprised.
It’s no secret, rebuilding your rig is one of the most labor (and wallet) intensive repairs out there. Sure, you want your engine to last another million miles but you also want the best price; so what should you choose- OEM or Aftermarket?

When it comes to engine parts, the aftermarket often gets a bad rep. The idea that aftermarket retailers sell cheap parts with zero warranty, delivered in a beat-up box written in another language couldn’t be further from the truth. 4BTdiesel is here to set the record straight; we only sell Rebuild Kits with new parts, zero core charges, and a 6-month warranty. On top of only offering premium quality parts, we also make sure you save up to 50% off OEM prices. So, when it comes to your rebuild, what’s left to want?

Need a little extra proof? Let’s talk Rebuild Kits.

• Kick your old engine to the curbwith a rebuild that will restore your engine to great working condition and extend the life of it. You can’t beat that!
• Give your engine a backbone with rod and main bearings constructed with a Tri-Metal material. 
• Go the extra mile, or a million extra miles with Piston Pins that are hardened and tempered for improved strength and wear resistance. The sheer power of these bad boys will keep you on the road and not on the side of it. 
• Don’t overpay! Quality will meet or exceed the OE’s at a much lower price. Don’t settle for ridiculous OE prices when you can save some hard earned cash. 
• Adding to the savings, all new parts are included and there is no core charge. Plus, to save time kits components are packed in subassemblies by function, making installation easy. 
• Also, fitment and functionality will not be a problem because strict OE specifications are met giving you the best of both.
• Trust the experts with a Rebuild Kit manufactured and assembled in an ISO 9001:2008 certified facility. Simply put, it’s quality and consistency you can count on.
• You’ll rest peacefully knowing the pistons included are CNC turned to precise tolerances making your life easier. To top it off, they are built with long lasting strength and durability for ultimate performance. 
• Additionally, computer controlled piston machining is used to maintain proper clearances, giving you peace of mind when out on the road.
• Keep oil where it needs to be with Oil Control Rings designed with precise tangential tension for maximum oil control. Your engine will be properly lubricated and ready to go when you need it. Adding onto that, the sealing products included are proudly USA made and are composed of 100% Asbestos-Free Material!
• Let’s seal the deal. The gaskets included are used with proper materials for maximum sealing performance, keeping your fluids where they need to be. It simply doesn’t get better than that!

Kit Contents

• (6) Connecting Rod Bearings
• (1) Main Bearing
• (6) Connecting Rod Bearings
• (1) Flange Gasket
• (1) Oil Pan Gasket
• (6) .50mm Piston Kits
• (12) Piston Pin Retainers
• (6) Piston Pins
• (6) .50mm ISB Engine Pistons
• (6) Piston Ring Sets
• (6) Top Piston Rings
• (6) .50 Second Piston Rings
• (6) Oil Rings
• (1) Upper Gasket Set
• (1) Breather Mounting Seal
• (3) Sealing Washers
• (6) Gaskets
• (1) Intake Manifold Cover Gasket
• (6) O-Ring Seals
• (2) Gaskets
• (1) Oil Drain Gasket
• (1) Turbocharger Gasket
• (1) Rocker Cover Gasket
• (1) Thermostat Seal
• (1) Rocker Cover Housing Gasket
• (6) O-Ring Seals
• (12) Valve Stem Seals
• (12) Valve Stem Seals
• (2) Lock Plates
• (6) O-Ring Seals
• (1) Cylinder Head Gasket
• (1) Cylinder Head Gasket
• (1) O-Ring Seal
• (2) O-Ring Seals
• (1) O-Ring Seal
• (2) Turbo Hose O-Ring Seal
• (1) O-Ring Seal
• (11) Sealing Washers
• (6) Mid Range XPI Injector Seals
• (6) Exhaust Manifold Gaskets

Warranty

6-month warranty.

What Rebuild Kit and Gasket Set Includes